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DOQs

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Digital Orthophoto Quadrangle (DOQ)

A Digital Orthophoto Quadrangle (DOQ) is a digital image that has the properties of an orthographic projection, derived from a digitized perspective aerial photograph or other remotely sensed image data by differential rectification so that image displacements caused by camera tilt and terrain relief are removed. The DOQ combines the image characteristics of the original photograph with the georeferenced qualities of a map. Ground features are displayed in their true position, allowing for the direct measurement of distance, areas, angles, and positions.

All DOQs have a UTM NAD83 Zone 12 North meters projection with the exception of the 1936-1952 Soil Conservation Service Photomaps that have a NAD27 datum.

2003 COLOR DOQs

1-meter color DOQs for most of Iron and Beaver counties from 2003. The date the photography was flown can be found in the .met metadata file after SOURCE_IMAGE_DATE in the image tile.

MID 1990'S BLACK AND WHITE DOQ

Statewide coverage of 1-meter resolution Black and White Digital Orthophoto Quads (DOQs). Some DOQs have 2 vintages , opens in a new tab of dates the images were flown. Usually one image will be from 1993 and another 1997 or newer. Refer to Find a DOQ , opens in a new tab for quadrangle names and associated UGRC Q number.

The .met metadata file is all the original header information from the image and contains the dates the images were flown and photographed. For more information about these DOQs refer to the DOQ Information Sheet , opens in a new tab .

1977 BLACK AND WHITE DOQs

1-meter Black and White DOQ of Salt Lake County from 1977. The DOQs are available as single quads and also as a Mr.Sid county mosaic. The date the photography was flown can be found in the .txt metadata file under Single_Date/Time: Calendar_Date: in the image tile.

1970'S 1 METER COLOR AND INFRARED DOQs

1-meter color and infrared imagery from the BLM collected in the 1970s. This is not a statewide coverage. The year the photography was flown can be found in the .xml metadata file after sngdate caldate in the image tile.

1936-1952 SOIL CONSERVATION SERVICE (SCS) PHOTOMAPS

1-meter Black and White Soil Conservation Service (SCS) Photomaps from 1936-1952. This is not a statewide coverage. The date the photo was taken can be found for some of the tiles in the Year field of the UGS SCS Historical index shapefile , opens in a new tab .

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